diff --git a/flake.nix b/flake.nix
index 23ece46..ecea4c4 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,8 +1,8 @@
 {
   inputs = {
-    nixpkgs.url = github:NixOS/nixpkgs/nixpkgs-unstable;
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
 
-    utils.url = github:numtide/flake-utils;
+    utils.url = "github:numtide/flake-utils";
 
     treefmt-nix.url = "github:numtide/treefmt-nix";
   };